What is inside your transmission
All automatic transmissions use a combination of friction materials (similar to paper or cardboard) bonded to metal plates and bands, rubber or neoprene seals, and bushings. These parts are considered soft parts, and will eventually wear out from normal usage. When these seals lose their flexibility and the friction materials and bushings become worn, slippage and other malfunctions become apparent. If these conditions are not corrected, more serious wear then occurs to the hard parts (metal drums, gears, and pumps) of the transmission.
Prevent transmission trouble before it starts
(How to prolong the life of a transmission and prevent trouble)
The cheapest, simplest way to prolong transmission life and avoid trouble is to change transmission fluid frequently and change or clean the filter or screen. This is the advise of knowledgeable mechanics who explain that the inhibitors in transmission fluid deteriorate with use. These inhibitors are specific formulas in the fluid that are designed to protect the internal parts of the transmission. When the inhibitors deteriorate, wear on these parts becomes excessive and trouble results. Fluid also becomes contaminated from deposits of worn off bushing and washer materials, and clutch plate linings. Although new car manuals generally ignore this important precaution, frequent, fresh fluid is mandatory. Transmission fluid should usually be changed from 10,000 to 15,000 miles if the entire system can be drained - from 5,000 to 8,000 miles if only the pan can be drained, depending on severity of use.
Check the transmission fluid regularly! If the unit is only as much as two quarts low, the transmission
will start to slip and slippage causes heat. Heat, in turn, speeds the deterioration of the inhibitors in the fluid.
Cavazos states Forcing the gears to shift at maximum acceleration is just asking for trouble.
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